package com.hmdp.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {

    private static final long BEGIN_TIMESTAMP = 1640995200L;

    // 序列号位数
    private static final long COUNT_BITS = 32;
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    public long nextId(String keyPrefix) {
        //1.生成时间戳
        LocalDateTime time = LocalDateTime.now();
        long nowSecond = time.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        //2.生成序列号
        //获取当前日期，精确到天
        String date = time.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        //3.拼接
        return timestamp << COUNT_BITS | count;
    }

    public static void main(String[] args) {

        LocalDateTime time = LocalDateTime.now();
        long time1 = time.toEpochSecond(ZoneOffset.UTC);
        System.out.println(time1);
    }
}
